@misc{WM_1907_11_Supplement_2_a3,
     title = {O rozk{\l}adach liczb ca{\l}kowitych na r\'o\.znic\k{e} dw\'och kwadrat\'ow},
     journal = {Wiadomo\'sci Matematyczne},
     pages = {87--110},
     publisher = {mathdoc},
     volume = {11},
     number = {Supplement_2},
     year = {1907},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/item/WM_1907_11_Supplement_2_a3/}
}